From bad4208da33f3ef2adf9af2b06a597f2ce23d228 Mon Sep 17 00:00:00 2001 From: Omar Sandoval Date: Thu, 18 Jan 2018 13:09:32 -0800 Subject: libbtrfsutil: add qgroup inheritance helpers We want to hide struct btrfs_qgroup_inherit from the user because that comes from the Btrfs UAPI headers. Instead, wrap it in a struct btrfs_util_qgroup_inherit and provide helpers to manipulate it. This will be used for subvolume and snapshot creation. Signed-off-by: Omar Sandoval Signed-off-by: David Sterba --- libbtrfsutil/qgroup.c | 83 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 83 insertions(+) create mode 100644 libbtrfsutil/qgroup.c (limited to 'libbtrfsutil/qgroup.c') diff --git a/libbtrfsutil/qgroup.c b/libbtrfsutil/qgroup.c new file mode 100644 index 00000000..d2916184 --- /dev/null +++ b/libbtrfsutil/qgroup.c @@ -0,0 +1,83 @@ +/* + * Copyright (C) 2018 Facebook + * + * This file is part of libbtrfsutil. + * + * libbtrfsutil is free software: you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * libbtrfsutil is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public License + * along with libbtrfsutil. If not, see . + */ + +#include +#include +#include +#include +#include + +#include "btrfsutil_internal.h" + +PUBLIC enum btrfs_util_error btrfs_util_create_qgroup_inherit(int flags, + struct btrfs_util_qgroup_inherit **ret) +{ + struct btrfs_qgroup_inherit *inherit; + + if (flags) { + errno = EINVAL; + return BTRFS_UTIL_ERROR_INVALID_ARGUMENT; + } + + inherit = calloc(1, sizeof(*inherit)); + if (!inherit) + return BTRFS_UTIL_ERROR_NO_MEMORY; + + /* + * struct btrfs_util_qgroup_inherit is a lie; it's actually struct + * btrfs_qgroup_inherit, but we abstract it away so that users don't + * need to depend on the Btrfs UAPI headers. + */ + *ret = (struct btrfs_util_qgroup_inherit *)inherit; + + return BTRFS_UTIL_OK; +} + +PUBLIC void btrfs_util_destroy_qgroup_inherit(struct btrfs_util_qgroup_inherit *inherit) +{ + free(inherit); +} + +PUBLIC enum btrfs_util_error btrfs_util_qgroup_inherit_add_group(struct btrfs_util_qgroup_inherit **inherit, + uint64_t qgroupid) +{ + struct btrfs_qgroup_inherit *tmp = (struct btrfs_qgroup_inherit *)*inherit; + + tmp = realloc(tmp, sizeof(*tmp) + + (tmp->num_qgroups + 1) * sizeof(tmp->qgroups[0])); + if (!tmp) + return BTRFS_UTIL_ERROR_NO_MEMORY; + + tmp->qgroups[tmp->num_qgroups++] = qgroupid; + + *inherit = (struct btrfs_util_qgroup_inherit *)tmp; + + return BTRFS_UTIL_OK; +} + +PUBLIC void btrfs_util_qgroup_inherit_get_groups(const struct btrfs_util_qgroup_inherit *inherit, + const uint64_t **groups, + size_t *n) +{ + struct btrfs_qgroup_inherit *tmp = (struct btrfs_qgroup_inherit *)inherit; + + /* Need to cast because __u64 != uint64_t. */ + *groups = (const uint64_t *)&tmp->qgroups[0]; + *n = tmp->num_qgroups; +} -- cgit v1.2.3